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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpufreq/apple,soc-cpufreq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple SoC cpufreq device
+
+maintainers:
+ - Hector Martin <marcan@marcan.st>
+
+description: |
+ Apple SoCs (e.g. M1) have a per-cpu-cluster DVFS controller that is part of
+ the cluster management register block. This binding uses the standard
+ operating-points-v2 table to define the CPU performance states, with the
+ opp-level property specifying the hardware p-state index for that level.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - apple,t8103-soc-cpufreq
+ - apple,t6000-soc-cpufreq
+ - const: apple,soc-cpufreq
+
+ reg:
+ minItems: 1
+ maxItems: 6
+ description: One register region per CPU cluster DVFS controller
+
+ reg-names:
+ minItems: 1
+ items:
+ - const: cluster0
+ - const: cluster1
+ - const: cluster2
+ - const: cluster3
+ - const: cluster4
+ - const: cluster5
+
+ '#freq-domain-cells':
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - reg-names
+ - '#freq-domain-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ // This example shows a single CPU per domain and 2 domains,
+ // with two p-states per domain.
+ // Shipping hardware has 2-4 CPUs per domain and 2-6 domains.
+ cpus {
+ #address-cells = <2>;
+ #size-cells = <0>;
+
+ cpu@0 {
+ compatible = "apple,icestorm";
+ device_type = "cpu";
+ reg = <0x0 0x0>;
+ operating-points-v2 = <&ecluster_opp>;
+ apple,freq-domain = <&cpufreq_hw 0>;
+ };
+
+ cpu@10100 {
+ compatible = "apple,firestorm";
+ device_type = "cpu";
+ reg = <0x0 0x10100>;
+ operating-points-v2 = <&pcluster_opp>;
+ apple,freq-domain = <&cpufreq_hw 1>;
+ };
+ };
+
+ ecluster_opp: opp-table-0 {
+ compatible = "operating-points-v2";
+ opp-shared;
+
+ opp01 {
+ opp-hz = /bits/ 64 <600000000>;
+ opp-level = <1>;
+ clock-latency-ns = <7500>;
+ };
+ opp02 {
+ opp-hz = /bits/ 64 <972000000>;
+ opp-level = <2>;
+ clock-latency-ns = <22000>;
+ };
+ };
+
+ pcluster_opp: opp-table-1 {
+ compatible = "operating-points-v2";
+ opp-shared;
+
+ opp01 {
+ opp-hz = /bits/ 64 <600000000>;
+ opp-level = <1>;
+ clock-latency-ns = <8000>;
+ };
+ opp02 {
+ opp-hz = /bits/ 64 <828000000>;
+ opp-level = <2>;
+ clock-latency-ns = <19000>;
+ };
+ };
+
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ cpufreq_hw: cpufreq@210e20000 {
+ compatible = "apple,t8103-soc-cpufreq", "apple,soc-cpufreq";
+ reg = <0x2 0x10e20000 0 0x1000>,
+ <0x2 0x11e20000 0 0x1000>;
+ reg-names = "cluster0", "cluster1";
+ #freq-domain-cells = <1>;
+ };
+ };